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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modulation of arterial pressure by P2 purinoceptors in the paraventricular nucleus of the hypothalamus of awake rats

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Author(s):
Cruz, Josiane C. [1] ; Bonagamba, Leni G. H. [1] ; Machado, Benedito H. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Physiol, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL; v. 158, n. 1-2, p. 79-85, DEC 8 2010.
Web of Science Citations: 6
Abstract

In the present study we evaluated the role of purinergic mechanisms in the PVN on the tonic modulation of the autonomic function to the cardiovascular system as well on the cardiovascular responses to peripheral chemoreflex activation in awake rats Guide-cannulae were bilaterally Implanted in the direction of the PVN of male Wistar rats Femoral artery and vein were catheterized one day before the experiments Chemoreflex was activated with KCN (30 mu g/0 05 ml iv) before and after microinjections of P2 receptors antagonist into the PVN Microinjection of PPADS a non selective P2X antagonist Into the PVN (n = 6) produced a significant increase in the baseline MAP (99 +/- 2 vs 112 +/- 3 mmHg) and HR (332 +/- 8 vs 375 +/- 8 bpm) but had no effect on the pressor and bradycardic responses to chemoreflex activation Intravenous injection of vasopres in receptors antagonist after microinjection of PPADS into the PVN produced no effect on the increased baseline MAP Simultaneous microinjection of PPADS and KYN into the PVN (n=6) had no effect in the baseline MAP HR or in the pressor and bradycardic responses to chemoreflex activation We conclude that P2 purinoceptors in the PVN are involved in the modulation of baseline autonomic function to the cardiovascular system but not in the cardiovascular responses to chemoreflex activation in awake rats (C) 2010 Elsevier B V All rights reserved (AU)

FAPESP's process: 04/03285-7 - Central mechanisms involved in the sympathoexcitation in response to hypoxia
Grantee:Benedito Honorio Machado
Support type: Research Projects - Thematic Grants